Details

An updated thunderbird package that fixes several security issues is nowavailable for Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as havingimportant security impact. Common Vulnerability Scoring System (CVSS) basescores, which give detailed severity ratings, are available for eachvulnerability from the CVE links in the References section.

Mozilla Thunderbird is a standalone mail and newsgroup client.

Several flaws were found in the processing of malformed content.Malicious content could cause Thunderbird to crash or, potentially, executearbitrary code with the privileges of the user running Thunderbird.(CVE-2013-5609, CVE-2013-5616, CVE-2013-5618, CVE-2013-6671, CVE-2013-5613)

A flaw was found in the way Thunderbird rendered web content with missingcharacter encoding information. An attacker could use this flaw to possiblybypass same-origin inheritance and perform cross site-scripting (XSS)attacks. (CVE-2013-5612)

It was found that certain malicious web content could bypass restrictionsapplied by sandboxed iframes. An attacker could combine this flaw withother vulnerabilities to execute arbitrary code with the privileges of theuser running Thunderbird. (CVE-2013-5614)

Note: All of the above issues cannot be exploited by a specially craftedHTML mail message as JavaScript is disabled by default for mail messages.They could be exploited another way in Thunderbird, for example, whenviewing the full remote content of an RSS feed.

Red Hat would like to thank the Mozilla project for reporting these issues.Upstream acknowledges Ben Turner, Bobby Holley, Jesse Ruderman, ChristianHoller, Masato Kinugawa, Daniel Veditz, Jesse Schwartzentruber, Nils, TysonSmith, and Atte Kettunen as the original reporters of these issues.

For technical details regarding these flaws, refer to the Mozilla securityadvisories for Thunderbird 24.2.0 ESR. You can find a link to the Mozillaadvisories in the References section of this erratum.

All Thunderbird users should upgrade to this updated package, whichcontains Thunderbird version 24.2.0 ESR, which corrects these issues.After installing the update, Thunderbird must be restarted for the changesto take effect.

Solution

Before applying this update, make sure all previously released erratarelevant to your system have been applied.